Добрый день.

Подскажите, есть ли возможность узнать причины дропов входящих пакетов на DGS-1510-28XS ?

Command: show error ports 25


Port Number : 25
RX Frames TX Frames
--------- ---------
CRC Error 11 Excessive Deferral 0
Undersize 0 CRC Error 0
Oversize 0 Late Collision 0
Fragment 0 Excessive Collision 0
Jabber 0 Single Collision 0
Drop Pkts 77364609 Collision 0
Symbol Error 3

1. Increment counter for IPv6 L3 discards (v6 packet search failed)
2. Increment counter for packets discarded due to IBP discard or CBP full (run out of packet buffer)
3. Increment counter for packets dropped when ingress port is not in forwarding state (if the port is under STP block/listen state, or under LBD loop)
4. Increment counter for receive policy discard (i.e. DST_DISCARD, SRC_DISCARD,RATE_CONTROL, etc.) (IMPB dropped entries)
5. Increment counter for packets dropped by the Content Aware Engine (ACL drop)
6. Increment counter for multicast (L2 + L3) packets that are dropped (multicast packets search failed)
7. Increment counter for packets dropped due to port bitmap of zero condition (destination port is link down, destination port is in the different VLAN, egress mask was been set)
8. Increment counter for receive VLAN drops (received packets with illegal VLAN tag)

Тоесть детальной статистки по какой причине дропнулось нет и остается только гадать по 8 пунктам ?

Это возможные варианты их появления. Более подробную информацию вам расскажет анализ трафика.